<?php
    /*多维数组*/
    
    $a = ['a','b','c'];
    $b = ['d','e','f'];
    $c = ['g','h','i'];
    
    // $arr1 = [0=>$a,1=>$b,2=>$c];
    
    $arr1 = [
                ['a','b','c'],
                ['d','e','f'],
                ['g','h','i'],
                'jingshui'
            ];
    // echo $arr1[1][1];
    // $d = ['x','y','z'];
    
    // $brr = [$arr1,$d,'jingshui'];
    
    /*项目中的数组*/
    $users = [
               0=>['name'=>'user1','sex'=>'man','age'=>18],
               1=>['name'=>'user2','sex'=>'woman','age'=>28],
               2=>['name'=>'user3','sex'=>'man','age'=>48],
               3=>['name'=>'user4','sex'=>'woman','age'=>38],
    
            ];
    
    // echo $users[1]['age'];

?>